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In order to ensure the implementation of the launch activities,grasp the state of the TT&C equipment and exclusion of system failure is the key point. According to the applied characteristics, the security requirements of the equipment were proposed. With virtual instrument technology, DataScoket technology, Labview and PXI bus system architecture, the expert system based on fault tree diagnosis and case fault diagnosis was specially designed. The information library was built with dual mode of fault tree and dictionary. Finally, through the real fault diagnosis example, the fault tree diagnosis is verified under system coordination condition, and the results show that the system meet the requirement of function design, moreover, the outcomes were reliable and the interaction could be friendly operated.